<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript" src="script/jquery-1.7.2.js"></script>
    <script type="text/javascript">
        $(function () {
            // $(":radio").val(["radio1"]);
            // //批量操作复选框的选中
            // $(":checkbox").val(["checkbox1","checkbox2"]);
            //
            // //批量操作多选的下拉框选中状态
            // $("#multiple").val(["mul1","mul2"]);
            //
            // //操作单选的下拉框选中
            // $("#single").val(["sin3"]);

            $(":radio,:checkbox,#multiple,#single").val(["radio1","checkbox1","checkbox3","mul3","sin3"]);
        });

    </script>
</head>
<body>
        单选：
         <input name="radio" type="radio" value="radio1" />radio1
         <input name="radio" type="radio" value="radio2" />radio2 <br/>
         多选：
         <input name="checkbox" type="checkbox" value="checkbox1" />checkbox1
         <input name="checkbox" type="checkbox" value="checkbox2" />checkbox2
         <input name="checkbox" type="checkbox" value="checkbox3" />checkbox3 <br/> 下拉多选 ：
         <select id="multiple" multiple="multiple" size="4">
             <option value="mul1">mul1</option>
             <option value="mul2">mul2</option>
             <option value="mul3">mul3</option>
             <option value="mul4">mul4</option>
         </select> <br/>
         下拉单选 ：
         <select id="single">
             <option value="sin1">sin1</option>
             <option value="sin2">sin2</option>
             <option value="sin3">sin3</option>
         </select>
</body>
</html>